SGER: Application of Dynamic Failure Mechanics to Material and Interface Selections for Protecting Critical Structures

摘要：SGER：动态破坏力学在保护关键结构的材料和界面选择中的应用，CMS提案0456807 PI：Luoyu Xu，范德比尔特大学美国本土正处于恐怖行动的迫在眉睫的危险之中。 尽管建筑物、桥梁、核电站等类似结构在极端事件中可能无法避免灾难性故障，但需要进行研究以保护关键结构。 在现有结构的情况下，实现这一目标的快速有效的方法是使用结构保护系统，如复合材料导管架。 以前复合材料在民用结构中的应用主要集中在疲劳或地震载荷下的结构修复（即，低应变率情况）。关于在冲击或爆炸载荷条件下（高应变率情况）使用复合材料和其他防护材料提高结构生存性的系统研究只得到初步注意。然而，基本的科学基础仍然严重缺乏。 本提案的目标是探索动态失效机制和力学的基本原理，在这些系统可以广泛应用于关键结构之前，使用保护系统来提高结构的生存能力。 这一目标将通过结合动态断裂力学分析的动态失效的实时、小规模模型实验来实现。 拟议活动的知识价值是确定了一个具有根本和实际重要性的跨学科领域。在将这些原理应用于实际的大型结构之前，可以通过精心设计的小比例模型实验来广泛地探索复杂的动力破坏机理和力学。 拟议的活动将促进动态失效力学领域内以及包括复合材料和结构工程在内的更广泛领域的知识和理解。 由于该项目侧重于一个对普通民众具有国际重要性的高度可见的研究领域，预计将对社会产生直接影响。

Abstract for: SGER: Application of Dynamic Failure Mechanics to Material and Interface Selections for Protecting Critical Structures, CMS proposal 0456807PI: Luoyu Xu, Vanderbilt UniversityThe American homeland is in imminent danger of terrorist action. Although buildings, bridges, nuclear power plants and like structures might not avoid catastrophic failure in extreme events, research needs to be carried out to protect critical structures. In the case of existing structures, a quick and effective way to achieve this goal is to use structural protection systems such as composite jackets. Previous applications of composite materials to civil structures were mainly focused on structural rehabilitation under fatigue or seismic loading (i.e., low strain rate situations). Systematic studies on improving structural survivability using composite materials and other protective materials under impact or blast loading condition (high strain rate situations) have received only preliminary attention. However, fundamental scientific groundwork is still significantly lacking. The goal of this proposal is to explore the fundamentals of dynamic failure mechanism and mechanics involved in improving structural survivability using protective systems, before these systems can be extensively applied to critical structures. This objective will be implemented through real-time, small-scale model experiments of dynamic failure incorporating dynamic fracture mechanics analysis. The intellectual merit of the proposed activities is the identification of an interdisciplinary area of fundamental and practical importance. Complicated dynamic failure mechanism and mechanics can be extensively explored through carefully designed small-scale model experiments before these principles are applied to practical large-scale structures. The proposed activities will advance knowledge and understanding within the field of dynamic failure mechanics and across broader fields including composite materials and structural engineering. Since this project is focused on a highly visible research area of international importance to the general population, it is expected to lead to an immediate impact on society.